The purpose of this first-in-man trial is to determine the safety and tolerability of ascending single and multiple doses of LEO 32731 in healthy male subjects. The trial will be performed in three parts. In Part 1, single doses of LEO 32731 will be administered to healthy male subjects. In Part 2, the effect of food on the single oral dose pharmacokinetic will be investigated. In Part 3, multiple doses of LEO 32731 will be administered to healthy male subjects.